Let $\mathbf{a},$ $\mathbf{b},$ $\mathbf{c}$ be three vectors such that $\|\mathbf{a}\| = \frac{1}{\sqrt{2}},$ $\|\mathbf{b}\| = \frac{1}{\sqrt{3}},$ $\|\mathbf{c}\| = \frac{1}{\sqrt{6}},$ $\|\mathbf{a} + \mathbf{b} + \mathbf{c}\| = 1,$ and
\[\mathbf{a} = k (\mathbf{b} \times \mathbf{c})\]for some scalar $k.$  Find the angle between $\mathbf{b}$ and $\mathbf{c},$ in degrees.
Since $\mathbf{b} \times \mathbf{c}$ is orthogonal to both $\mathbf{b}$ and $\mathbf{c},$ $\mathbf{a} \cdot \mathbf{b} = 0$ and $\mathbf{a} \cdot \mathbf{c} = 0.$

Since $\|\mathbf{a} + \mathbf{b} + \mathbf{c}\| = 1,$
\[(\mathbf{a} + \mathbf{b} + \mathbf{c}) \cdot (\mathbf{a} + \mathbf{b} + \mathbf{c}) = 1.\]Expanding, we get
\[\mathbf{a} \cdot \mathbf{a} + \mathbf{b} \cdot \mathbf{b} + \mathbf{c} \cdot \mathbf{c} + 2 \mathbf{a} \cdot \mathbf{b} + 2 \mathbf{a} \cdot \mathbf{c} + 2 \mathbf{b} \cdot \mathbf{c} = 1.\]From what we know, this becomes
\[\frac{1}{2} + \frac{1}{3} + \frac{1}{6} + 0 + 0 + 2 \mathbf{b} \cdot \mathbf{c} = 1.\]Hence, $\mathbf{b} \cdot \mathbf{c} = 0.$  This means the angle between $\mathbf{b}$ and $\mathbf{c}$ is $\boxed{90^\circ}.$