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Mrs. Plansky is a the perfect protagonist - likable, flawed, eccentric, unreliable. She loves her family and supports them to a fault, so when she receives a call from her grandson asking for money, she immediately complies.
I became frustrated about halfway through when a few too many happy coincidences took place. For that reason, I find it hard to imagine a second book in this series, as the first already required a lot of implausibilities