1. ... Qxd5+
2. Kc2 Qa2+
3. Kc1 Qa1+
4. Kc2 Qxc3+
5. Kb1 Qb2#
or
1. ... Qxd5+
2. Kc2 Qa2+
3. Kd3 Qc4+
4. Kc2 Qxc3+
5. Kb1 Qb2#
There are other minor variations. If you think you can see a way out for white, please comment below and I will add extra analysis.
